Clinical Study Relating to Patients Undergoing Medial Femoral Patellar Ligament Reconstruction

Inclusion Criteria: * The potential person is of legal age, capable of providing informed consent and must sign the Informed Consent Form approved by the Ethics Committee (EC). * Diagnosis of MPFL injury, performed before surgery, documented by Magnetic Resonance Imaging (MRI) of the affected knee. * Absence of osteochondral lesions larger than 3 cm2 at the baseline. * The contralateral knee was and is asymptomatic, stable and functional. * The patient must be physically and mentally inclined and must have completed post-operative rehabilitation according to the protocol provided at the time of discharge. Exclusion Criteria: * Local or systemic infection * Knee osteoarthritis documented radiographically at baseline * Articular cartilage injury greater than grade I of Outerbridge detected during surgery. * History of anaphylactic reaction. * Systemic therapy with all types of corticosteroids or immunosuppressants in the 30 days prior to surgery. * Evidence of osteonecrosis in the involved knee. * History of rheumatoid arthritis, inflammatory arthritis or autoimmune pathologies. * Neurological pathologies or conditions that the patient is unsuitable for the rehabilitation protocol. * Untreated meniscal tissue loss greater than 50% at baseline. * State of pregnancy. * Obese or with body mass index BMI\> 30 kg / m2. * Association of Trocleoplasty (intervention that produces degenerative changes in the joint in high apercent).